On our RS/6000 system with AIX 3.4 and 4 physical drives we had the boot disk
die. We replaced it and restored the system info from backups. The backups
were a bit old, but I don't think anything much had changed. It boots up fine
now, but it can't mount any of filesystems on the other 3 drives. For the
ones that don't mount in /etc/filesystems they all point to devices that
don't exist and I guess are logical volume devices because they look like
/dev/lvXX. I don't know AIX very well, I'm primarily a Linux guy.

Mounting doesn't work:

# mount /engr/worx
mount: 0506-324 Cannot mount /dev/lv09 on /engr/worx: A file or directory in
the path name does not exist.